Misfiring

• CorvetteFever.com says optispark failure is almost inevitable. The most common failure is misfiring. The optispark becomes misaligned, throwing off the spark plug timing.
  
  

Hard Starting

• A bad optispark can make the vehicle have trouble starting. Loud and unusual noises when the engine starts can be an indication of optispark trouble.
  
  

Poor Power

• Reduced engine power is a common symptom of optispark failure. Acceleration that is slower than normal is the most obvious indication of reduced engine power.
  
  

Check Engine Light

• The check engine light usually will come on when the vehicle experiences optispark issues. This makes diagnosing the problem easier. Mechanic shops can connect to your car's computer and extract codes that tell the exact problem.